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Tommy Walsh's DIY Guide
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Tommy Walsh's DIY Guide (2001)(Empire).iso
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t8g.txt
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1998-10-06
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Summary
There are many tasks to take into consideration when installing
a waste pipe. Follow these steps to learn more about these
tasks ;
1. About the soil stack or hopper.
2. Planing the pipe route.
3. About the total fall rate of the pipe work.
4. Fitting supporting brackets.
5. Considerations for complex pipe work.
6. When to use a self-cutting attachment.
7. Connecting to a soil stack.
8. About the swept-tee connector
Tools
File, Hacksaw, Drill, Drill Bits.
Materials
Solvent, Wall Plugs, Screws.
Step 1 - About the soil stack or hopper
Waste pipes must discharge into a soil stack. Properties with
systems in place before the 1960Æs may discharge into an open
hopper at the first floor level but must never discharge into
the rain water pipe.
Step 2 - Planning the pipe route
Before starting work you must plan the most direct route for
the waste to travel. Use a series of 90 and 135 degree bends to
change direction. Try to avoid using bends close to each other
as this increases the risk of blockage.
Step 3 - About the total fall of the pipework
Because waste systems are not pressure driven, gravity dictates
the speed at which the waste will flow. Waste pipe should have
a fall of between 18-90mm inches per metre.
Step 4 - Fitting supporting brackets
Supporting brackets must be used every 500mm horizontally and
every 1.2m vertically.
Step 5 - Considerations for complicated runs
If the run you have designed is complicated then instead of
using an elbow joint use swept tee connectors with access
plugs that will allow for easy access to unblock.
Step 6 - When to use a self-cutting attachment
A self-boring attachment is available for waste pipe runs
which may prove appropriate if there is a suitable waste
pipe nearby. They generally require less skill and are
usually more hygienic to fit.
Step 7 - Connecting to a soil stack
One way of connecting to a plastic soil stack is to use a
proprietary strap on boss connector. To do this you will
need a hole cutting tool for your drill, some solvent cleaner
and solvent cement. Connecting to metal stack is possible but
it may be easier to have it replaced with a plastic one.
Step 8 - About using the swept-tee connector
As an alternative to a self cutting tool you can also cut into a
waste pipe using a swept tee connector which allow easy flow of
water downwards. Fitting is similar to fitting a standard tee
connector the only thing to remember is to keep the sweep in the
direction of the flow.